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Diindenosilole Si1, a silicon-bridged fulvalene derivative, was successfully reduced to its dianions using various alkali metals, and the structures were characterized by X-ray crystallographic analysis. Radical anions of Si1 as well as dianions of π-extended Si3 could also be synthesized, and the structural and physical properties were systematically compared. It was also found that the NMR spectra of dianions Si12– and Si32– show countercation and temperature dependency for their signal broadness, indicating the possible existence of thermal interconversion between closed-shell singlet states and open-shell triplet states. [ABSTRACT FROM AUTHOR]

A copper/N-heterocycliccarbene catalyzed hydroboration of carbondioxide has been developed to give a formic acid derivative selectivelyunder mild conditions. Investigations directed toward understandingthe catalytic cycle of this process have been carried out, and thehydroboration product can be directly used as a formylation reagentfor various amines. [ABSTRACT FROM AUTHOR]